ZES ZIMMER LMG450, User Manual

Page: 87 / 306

Z E S ZIMMER Electronic Systems GmbH Chapter 5
87
Wiring ‘2+2, U
∆
I*-> U*I*’
Measuring channel numbers Circuit numbers
Display channel u(t) i(t) U I
1 u
1
(t) i
1
(t) U13 I1
2 u
2
(t) i
2
(t) U23 I2
3 u
3
(t) i
3
(t) U13’ I1’
4 u
4
(t) i
4
(t) U23’ I2’
5 -u
1
(t)+u
2
(t) -i
1
(t)-i
2
(t) U12 I3
6 -u
3
(t)+u
4
(t) -i
3
(t)-i
4
(t) U12’ I3’
7 2u (t) u (t)
3
1 2
−
i
1
(t) U1 I1
8
3
(t) u (t) u -
1 2
−
-i
1
(t)-i
2
(t) U2 I2
9
3
(t) u (t) u 2
1 2
−
i
2
(t) U3 I3
10 2u (t) u (t)
3
3 4
−
i
3
(t) U1’ I1’
11
3
(t) u (t) u -
3 4
−
-i
3
(t)-i
4
(t) U2’ I2’
12
3
(t) u (t) u 2
3 4
−
i
4
(t) U3’ I3’
For circuit see 3.3.5, ‘Measuring circuit for measuring efficiency of 3/3phase systems’.
For further information about the tables see also chapter 2.5, ‘Linked values’.
5.3.1 Values from single measuring
Voltage and current
true root mean square:
Utrms
T
u t dt
t
T
=
=
∫
1
2
0
( ) Itrms
T
i t dt
t
T
=
=
∫
1
2
0
( )
DCn negative DC component:
Udcn
T
u t for u t
for u t
dt
t
T
=
<
≥






=
∫
1
0
0 0
0
( ) ( )
( )
Idcn
T
i t for i t
for i t
dt
t
T
=
<
≥






=
∫
1
0
0 0
0
( ) ( )
( )
DCp positive DC component:
Udcn
T
u t for u t
for u t
dt
t
T
=
≥
<





 =
∫
1
0
0 0
0
( ) ( )
( )
Idcn
T
i t for i t
for i t
dt
t
T
=
≥
<





 =
∫
1
0
0 0
0
( ) ( )
( )
DC component:
Udc
T
u t dt
t
T
=
=
∫
1
0
( ) Idc
T
i t dt
t
T
=
=
∫
1
0
( )